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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c7020d7880d0d7d50db60d5b5ceb2c5441a9b0a6f824766c98721b54dfc12d' 
  AND token = '2OCshSWtRIy4Mir310gY2o7PZ85qgDDNRtbN/JkaTzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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