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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a7d9f01cb5dde9d78b0bc00c9d2651ca6cf57c5d9cb844393042c44cbc99008' 
  AND token = 'oqSHLbM2k/SQ2+/d66l2Mrit1Gwi+wvXKStykKHYT4I=' 
  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"
    }
  }
}