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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ea29f803a2d5b179a78898850da51d5a36c09d4c7a176059ad1aad6385f05a' 
  AND token = 'SiHbrUrQqaHKGtgDW3WcwfALdjIN0QwJELgddBo8zzM=' 
  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"
    }
  }
}