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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80c3fadd5859d13b902edf3be03fd3dd293275e12636af47977d9f2b5cbf122d' 
  AND token = 'yJvyhHzGeL/DfJaq9vPZdm22KsxIkxNmRk+6K0A3/xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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