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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326c5c9692b1a9f66c1416ff40110a7a1c5d3ffb437cafe35e2f74a0ca456640' 
  AND token = 'Szji1CgZ4VMUGCNkQWs81O0wkrGTyvLkYlj93asopLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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