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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ac7d369db9aad85939601a50231c64382d91508023588c2e2e7165eb81fb60' 
  AND token = '4ELtn1ZY5U/LpV0wsDg0GxVx8KbuhpSUoaPtMrFDXbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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