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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dad1c667892d3adcafe4736ed1f505361f364d494b9d1d0a733ff93017913f7' 
  AND token = 'PTEZF5QiwAXGtoV/rtxNy9TeruzmCWRJhFOZ8PBR5nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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