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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac760d084f130d8dfce05ed2f9725129302a67c2e376768378581de1e0d0163' 
  AND token = 'okRf1J8RUQOnPwCn4Af0mvGZny/24F3ukSeu5D92Eig=' 
  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"
    }
  }
}