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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777686e382c77f6effef108d8cf2427b12a37f545c390f7507a26d090c51a3ff' 
  AND token = 'bmzh73Ipcc7Aa3psa+qhntiOmb95ZCc+rvRYbYFNT9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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