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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b3671afd2d3d1357e0db98bc5ab236bbddafc3ae7c62562f6bb67406e12f81' 
  AND token = 'U7zaGOEjT/iQKus/xeUmk2AGX1Fl2NIv6TIgJrkaiEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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