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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d55dc3f3959c14ac0835fb5a68b25b6122559b9e34e8bae1f485effad326b2' 
  AND token = 'oUpC8I33GXBMM1G4NGRg17D2S+l9c4J0PoqMPlPJ/o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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