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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf759de32ae2a81f98cfd0f4b31dcdf37ef41fe8f10163a3e32314d78889131c' 
  AND token = '+KbY2sSO7kPvL178exwDycFjexX6iyvGN6SV4pWdfAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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