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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92974cbd174fd676e5d98e2ecc0cf7a482b98e37f66c2f67d3feb3560f2d0933' 
  AND token = 'reSPiRN4Fe3Lj/T8JW6KFpUCPTbN7WFMGT42a8uJC00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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