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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c07615d8be33c2d741e2aed43262a1d0bf8f833c8e46a596187da94a2224e1c' 
  AND token = '61RvF/1URFbRAg2I45u7xYvX/kovWc8pYRksCrCJMKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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