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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9686ca108cfc9d4184b959591471d88f5cb9e7dd875f7f6deccf933a63e7763' 
  AND token = '5GfPzooITDtN6ZBDy+8IpOwT0YrYqv/54XbQvWfWxNI=' 
  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"
    }
  }
}