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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b1f5d734951aa6bd6771ea29e63ea9899bb035da2811ee61bfd16c9e6a741b' 
  AND token = 'PAs4j7Bzp408Ikktjkpz8I1SPOPhPY3OJGTbnDv8K1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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