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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2dd627e7a779dca64838ad711fc3227eac6b9ac660ac1e68fcbbc543505f85' 
  AND token = 'dsRpzwg1tzg0STYJJLgopopixQn2Un9oi51MxF4UZZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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