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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3726107fb65c7fc69780628f53ca828275329b833a2cc06999c59ea722233d86' 
  AND token = 'r5ETa47QhnsnDRXI15N/fGqzZG48QoF4YVP1E2SN73I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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