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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '429b4989f3ba8a255cde25445506bb526e453c122d37fdd9a0ba4d8b1f821f54' 
  AND token = '0VikRtSRl2vMzyPAYT+E49/9IP3Q4bf4IEUW7ML9VAQ=' 
  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"
    }
  }
}