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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98e6f5fc1b11d1ae2248f8dc4190b7cd47b63259adcddc9d9cca2606c2980ef' 
  AND token = '7IQf1rx3do3t2WxZX0zc7DzLURoowm8/H0TM69/pB8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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