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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a2766e6e06b1c79048699d6e3f9767ddabb58bede7635ba42ca3a102ebeef4' 
  AND token = 'HR/PYe8fz4pcKMJp10c0zAtW+K+la9MWtnwwKovsYHA=' 
  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"
    }
  }
}