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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af1f0ef78539dadd603e432b7f37ace49823911dfc039436465fe6163d5219a' 
  AND token = '1DrHH0VsXqm1nx9VsOiabUWoCj/7/yjGfQnjXkVeHBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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