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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6733a0f114158fdb1da95ec57f293edfcc564dbb8d9095d68ea894d1a8e29a2' 
  AND token = 's7gsZlMoumz9ZbiymuJhJ6xKICadIW0DoAQgyjJa8GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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