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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a6c516b2e96c5e1d8b5220f04d4eb35b3ddb04c988f4135d64ab43c310814b' 
  AND token = 'H4xL0Aq4qFm86bKSRzePG10x/sZfhzjBcrbEMdCPcpA=' 
  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"
    }
  }
}