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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73da252f13e3a51caa41f265ec13fad96e36464aa5ab8e788746ebbb865709e2' 
  AND token = 'VHPLpIy33z70c1El9hSHciwHbZ8olQI6f+mrlEpuniA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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