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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cdde09b792bf27698807f6b3f47ae1763a3f343acecaef43433243bf57f1d0a' 
  AND token = 'sFBhbSCsPQDGe/lI0TQ4a8fyoQ1XhKmHAlB9EAhBD24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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