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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f527cd31d4aa18300db69683c3df31bb464dd7d27ab204d274eab196c6eae2' 
  AND token = '91PHgmBiRhRzOyCwJrWK3kAW4zAwbjW/d3R9eHT9nkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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