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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '563298097ef25ad1d57beec547b77ab8739a2f6ff4754b9ade9d1a94f89e57d2' 
  AND token = 'WUvmHN3eFk0PJfK0e5DA2VoXlFokx1S+tbpWFRs02C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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