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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9267009e18c8f5075b365f7b8bec6671b8f31a62286255b6bdff6e6d9cd466fc' 
  AND token = '7iMPJCQZPIetcMcfsWf1B/cdKqfuzDLc9RmA4pGlJio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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