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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8aa64c1f52600769b1d0fe23ea9600211a79db43d48f42288c12766f06d672c' 
  AND token = 'y7dq0gIW9MZ293Ks3qgdilgAu5VSGTPa1lg+uPLOTgM=' 
  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"
    }
  }
}