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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7336d66d69ef4d7e2ac86c5a0cae5a210d20a2f66cda8f6f70594c246d9695f0' 
  AND token = 'tfTf+P0DMHArscZHxEcs4RyIpISA/QMGLXQidlXUnEs=' 
  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"
    }
  }
}