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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a69c91ae97116882412c3ebfbbc8a52ca34c8ca061ff3a2e400a2b78a54439' 
  AND token = 'SVIVnYfYxIh/U6pH9b4WxaAGhB5yjsbDrCdgmpugT2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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