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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6a750b1e2e916f5dfb74ab3a6592a7eb05983a60eaf09cf57e36f41ace0b2b' 
  AND token = 'rx6DD0zI/Nvxu9IHFUcCyLpMFV15i/QnBXzVkx7/pUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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