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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab75bcfb11615de7e882b4d2952cb1e8c0eb7dd2a87f6e5d0164f0cd39579ffb' 
  AND token = 'y/CfcyvE9wcl7EmzAYaH26WpXL647PJSyyFroxr4BTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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