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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb984ccf4fad5c371d3bd1fe0dee26542b9d0792b7513c34a050d2131a7522dc' 
  AND token = 'BoC6jPPl3Z+CbnXgfNpz9e8DO+ad/9ULla1LqMj3YV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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