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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ae0c979bc0693b7918259791781e8bf64902b36d50105a62f90c11a3cb602a' 
  AND token = 'nPMB6233htLX0PWfgyi+vp9BCypOqVPy9q3fzM7Rr3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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