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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6978dc9b8ff43a9e4f54e4e42b088c98f7b47d2c6f8d4bfb50d11f10b5c1a63' 
  AND token = 'TAqdBs9llQkATY/noUs3T/GPE0WPD41Lg8cFNSE83TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}