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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdfd3ebe1941d23c260089c3f490e6274596c55f5d7c27057411f9f6caaf80ed' 
  AND token = 'bxPkr3O6VREhE+kTIo/MQm5R9itTBVGYyOl48DYP6bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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