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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c61438577b94b851e73fdeff4690e279b722f4e0249500d0ca2730a4fb63c7' 
  AND token = 'OuIacBzqzy4CfZOTFOabz+NerSXW2lR7VA1eBvwDXVM=' 
  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"
    }
  }
}