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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f4823de9c77ba03aeb24bcf6a840ab218918810d9e2ec0f8d9ff2176280181' 
  AND token = '2Lcvqb6mO7cWY/l8fEukg8NhwXZH/fks2s9UP2+fq7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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