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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c55d8ee058f072c98347967d8c41fb6b92d1bd59040b491fb47ee161f9555ab' 
  AND token = 'OnOww5C0jcz6QRwLpDMprXUfynNk58GH2640r7hlSXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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