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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64ed99698407aa97b831d4b6c1a7da358abe7d58897c7e7db9697b5612d8965' 
  AND token = 'qyLrahFhsyAb4Wm7/nMX/umRbKeqQtoF8KSR5jLuXUk=' 
  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"
    }
  }
}