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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2446159e82fc0025d8957e69e5d996604e0cf3e028f061a4f9523ffb5cf8842' 
  AND token = 'uOx3xy0F6JQR+3DHh7A7DXQmERKW3Bw+XC4Y9SLqt6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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