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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89165cc74ffb1056e2468bb5d1820081bc7ccf57a1aa77fe8c1981bc881be69b' 
  AND token = 'kB92GxkSLhb+udHQ/ZB3fKlhQvTyK5H4U6UN2/rTMrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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