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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e904e75f3740b09127b52a767036a9c688838938537edc61e32f536c7fa83696' 
  AND token = 'GyhpBAfOF4MB17yY1plZZISgNACSwBbe4V2PfTEV14Q=' 
  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"
    }
  }
}