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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5954916a2e716a25fbd3df3e6289fdf4c3ecbf23d1db9d2fa8070e711d4c38' 
  AND token = '3Goi5Z9/VOIBljIrOT/Bffx/qbEUujcl2QCb0WFHrng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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