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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bed07db20148294a18604e5e8b8cc9f09b1e7f91a1cc0c5d6bee82c7d72500' 
  AND token = 'vA/MiDQM3yy7kF2LtH99Nkx2QYap9RNOE0WGQLE+lTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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