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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b24b709eaa2b877c23e0ec3ee9cc6f7b7f9d2d7e31764a8953a52810297803' 
  AND token = 'dgVYjc6sXcc7sQ9xukoWxGdtFOZTi1kVG62vRs8hrMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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