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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7978612519b1cc79544a2ceed9d6c7b1fbb7b8b934b209b915dc30b389e324' 
  AND token = 'B3pga87x+b9sS2E+KSp1P36f9aAjTKS3AgoZyr50LxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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