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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b70ff1d1a9f1ec8684141e02c38e1a5efd1990be3054b6a3836d938fe65d578' 
  AND token = '9ZpfFZIUeGp9BW3yqR+nbp71f9Munm0/mHVIrE9P6Ec=' 
  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"
    }
  }
}