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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e87b54c7e7cdf46dfa63803bc9d5f95db78bc90d97183c4cf73e27a2f9a20a4' 
  AND token = 'DRFi1foS9LKppKo5AsVoj1fMlCixEfFPCvQGmrqrJ50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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