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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5523b3d07967f6d4f26f928976d718f08657ab2f530176b3f1426390d0f4e2d1' 
  AND token = '3V68V4jucRrS34KIIUtQkiUpXkaSCK4dx51priU1/wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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