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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c438d7a80412d6c64d197a9ec9119563639694e4560b02f218074306709ae06d' 
  AND token = 'RcY+1GQ8KUUSfsU4xtWA3JC09wlFxV3q9+q+xU1caVI=' 
  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"
    }
  }
}